The Sylvania lamp replacement guide lists the 3457 as the replacement DRL bulb. The site lists the 3357a/3457ast for the same price - $22.49. The site also states that all three are dual filament bulbs.
http://www.sylvania.com/auto/sssignal.htm
The only other difference that I could determine was the 3057 is listed at 27 watts while the 3457 is listed at 29 watts - nothing on the 3157's.
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